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</head><body><div id="loading-box"><div class="loading-left-bg"></div><div class="loading-right-bg"></div><div class="spinner-box"><div class="configure-border-1"><div class="configure-core"></div></div><div class="configure-border-2"><div class="configure-core"></div></div><div class="loading-word">加载中...</div></div></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src= "" data-lazy-src="/blog/img/favicon.png" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/blog/archives/"><div class="headline">文章</div><div class="length-num">155</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/blog/tags/"><div class="headline">标签</div><div class="length-num">56</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/blog/categories/"><div class="headline">分类</div><div class="length-num">32</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/blog/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/blog/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/blog/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/blog/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/blog/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('/blog/img/defaultCover.png')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/blog/">Albert Yuan's Blog</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/blog/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/blog/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/blog/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/blog/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/blog/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Swift_Kingfiser源码解析</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-09-09T13:01:25.519Z" title="发表于 2022-09-09 21:01:25">2022-09-09</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-09-09T13:51:34.723Z" title="更新于 2022-09-09 21:51:34">2022-09-09</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/blog/categories/Swift/">Swift</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>4分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Swift_Kingfiser源码解析"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="Kingfisher源码解析一：基础使用"><a href="#Kingfisher源码解析一：基础使用" class="headerlink" title="Kingfisher源码解析一：基础使用"></a>Kingfisher源码解析一：基础使用</h3><h4 id="1-基本使用"><a href="#1-基本使用" class="headerlink" title="1.基本使用"></a>1.基本使用</h4><h5 id="1-1图片设置"><a href="#1-1图片设置" class="headerlink" title="1.1图片设置"></a>1.1图片设置</h5><h6 id="1-1-1-通过Resource设置图片—-图片URL"><a href="#1-1-1-通过Resource设置图片—-图片URL" class="headerlink" title="1.1.1 通过Resource设置图片—-图片URL"></a>1.1.1 通过Resource设置图片—-图片URL</h6><blockquote>
<p>Kingfisher中内置的ImageResource和URL实现了Resource协议，ImageResource和URL的区别是ImageResource可自定义cacheKey。</p>
</blockquote>
<ul>
<li>URL 方式设置</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> url <span class="operator">=</span> <span class="type">URL</span>(string: <span class="string">&quot;https://test/image.jpg&quot;</span>)<span class="operator">!</span></span><br><span class="line">imageView.kf.setImage(with: url)</span><br></pre></td></tr></table></figure>

<ul>
<li>ImageResource 方式设置：可以添加cachekey</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//设置cache</span></span><br><span class="line"><span class="keyword">let</span> imageResource <span class="operator">=</span> <span class="type">ImageResource</span>(downloadURL: url, cacheKey: <span class="string">&quot;custom_cache_key&quot;</span>)</span><br><span class="line">imageView.kf.setImage(with: imageResource)</span><br></pre></td></tr></table></figure>

<hr>
<h6 id="1-1-2-通过ImageDataProvider设置图片-图片数据提供器-—–Data"><a href="#1-1-2-通过ImageDataProvider设置图片-图片数据提供器-—–Data" class="headerlink" title="1.1.2 通过ImageDataProvider设置图片(图片数据提供器)—–Data"></a>1.1.2 通过ImageDataProvider设置图片(图片数据提供器)—–Data</h6><blockquote>
<p>Kingfisher内置了LocalFileImageDataProvider，Base64ImageDataProvider，RawImageDataProvider三种ImageDataProvider。用户可自定义。</p>
</blockquote>
<ul>
<li>LocalFileImageDataProvider 通过本地图片路径获取图片数据</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> fileUrl <span class="operator">=</span> <span class="type">Bundle</span>.main.url(forResource: <span class="string">&quot;image&quot;</span>, withExtension: <span class="string">&quot;jpg&quot;</span>)<span class="operator">!</span></span><br><span class="line"><span class="keyword">let</span> imageDataProvider <span class="operator">=</span>  <span class="type">LocalFileImageDataProvider</span>(fileURL: fileUrl)</span><br><span class="line">imageView.kf.setImage(with: imageDataProvider)</span><br></pre></td></tr></table></figure>

<ul>
<li>Base64ImageDataProvider 通过base64字符串获取图片数据</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> base64String <span class="operator">=</span> <span class="string">&quot;....&quot;</span></span><br><span class="line"><span class="keyword">let</span> base64ImageDataProvider <span class="operator">=</span> <span class="type">Base64ImageDataProvider</span>(base64String: base64String, cacheKey: <span class="string">&quot;base64_cache_key&quot;</span>)</span><br><span class="line">imageView.kf.setImage(with: base64ImageDataProvider)</span><br></pre></td></tr></table></figure>

<ul>
<li>RawImageDataProvider 直接通过二进制数据设置</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> data <span class="operator">=</span> <span class="type">Data</span>()</span><br><span class="line"><span class="keyword">let</span> dataImageDataProvider <span class="operator">=</span> <span class="type">RawImageDataProvider</span>(data: data, cacheKey: <span class="string">&quot;data_cache_key&quot;</span>)</span><br><span class="line">imageView.kf.setImage(with: dataImageDataProvider)</span><br></pre></td></tr></table></figure>

<ul>
<li>自定义ImageDataProvider</li>
</ul>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//定义 ImageDataProvider的协议类</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">struct</span> <span class="title class_">FileNameImageDataProvider</span> : <span class="title class_">ImageDataProvider</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">let</span> cacheKey: <span class="type">String</span></span><br><span class="line">  </span><br><span class="line">   <span class="comment">//自定义属性</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">let</span> fileName: <span class="type">String</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">init</span>(<span class="params">fileName</span>: <span class="type">String</span>, <span class="params">cacheKey</span>: <span class="type">String</span>? <span class="operator">=</span> <span class="literal">nil</span>) &#123;</span><br><span class="line">        <span class="keyword">self</span>.fileName <span class="operator">=</span> fileName</span><br><span class="line">        <span class="keyword">self</span>.cacheKey <span class="operator">=</span> cacheKey <span class="operator">??</span> fileName</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">	  <span class="comment">//实现协议方法</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">func</span> <span class="title function_">data</span>(<span class="params">handler</span>: <span class="keyword">@escaping</span> (<span class="type">Result</span>&lt;<span class="type">Data</span>, <span class="type">Error</span>&gt;) -&gt; <span class="type">Void</span>) &#123;</span><br><span class="line">        <span class="keyword">if</span> <span class="keyword">let</span> fileURL <span class="operator">=</span> <span class="type">Bundle</span>.main.url(forResource: fileName, withExtension: <span class="string">&quot;&quot;</span>) &#123;</span><br><span class="line">            handler(<span class="type">Result</span>(catching: &#123; <span class="keyword">try</span> <span class="type">Data</span>(contentsOf: fileURL) &#125;))</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">let</span> error <span class="operator">=</span> <span class="type">NSError</span>(domain: <span class="string">&quot;文件不存在&quot;</span>, code: <span class="operator">-</span><span class="number">1</span>, userInfo: [<span class="string">&quot;fileName&quot;</span>:fileName])</span><br><span class="line">            handler(.failure(error))</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//使用</span></span><br><span class="line"><span class="keyword">let</span> fileNameImageDataProvider <span class="operator">=</span> <span class="type">FileNameImageDataProvider</span>(fileName: <span class="string">&quot;image.jpg&quot;</span>)</span><br><span class="line">imageView.kf.setImage(with: fileNameImageDataProvider)</span><br></pre></td></tr></table></figure>

<hr>
<h5 id="1-2展示placeholder"><a href="#1-2展示placeholder" class="headerlink" title="1.2展示placeholder"></a>1.2展示placeholder</h5><h6 id="1-2-1-通过UIImage设置"><a href="#1-2-1-通过UIImage设置" class="headerlink" title="1.2.1 通过UIImage设置"></a>1.2.1 通过UIImage设置</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> placeholderImage <span class="operator">=</span> <span class="type">UIImage</span>(named: <span class="string">&quot;placeholder.png&quot;</span>)</span><br><span class="line">imageView.kf.setImage(with: url, placeholder: placeholderImage)</span><br></pre></td></tr></table></figure>

<h6 id="1-2-2-通过自定义View设置placeholder"><a href="#1-2-2-通过自定义View设置placeholder" class="headerlink" title="1.2.2 通过自定义View设置placeholder"></a>1.2.2 通过自定义View设置placeholder</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 定义</span></span><br><span class="line"><span class="comment">// 需要使自定义View遵循Placeholder协议</span></span><br><span class="line"><span class="comment">// 可以什么都不实现，是因为当Placeholder为UIview的时候有默认实现</span></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">PlaceholderView</span>: <span class="title class_">UIView</span>, <span class="title class_">Placeholder</span> &#123;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 使用</span></span><br><span class="line"><span class="keyword">let</span> placeholderView <span class="operator">=</span> <span class="type">PlaceholderView</span>()</span><br><span class="line">imageView.kf.setImage(with: url, placeholder: placeholderView)</span><br></pre></td></tr></table></figure>

<hr>
<h5 id="1-3-加载GIF图-二者的区别请参考Kingfisher源码解析之加载动图"><a href="#1-3-加载GIF图-二者的区别请参考Kingfisher源码解析之加载动图" class="headerlink" title="1.3 加载GIF图 (二者的区别请参考Kingfisher源码解析之加载动图)"></a>1.3 加载GIF图 (<a target="_blank" rel="noopener" href="https://juejin.cn/post/6844904009464053773">二者的区别请参考Kingfisher源码解析之加载动图</a>)</h5><h6 id="1-3-1通过UIImageView加载GIF图"><a href="#1-3-1通过UIImageView加载GIF图" class="headerlink" title="1.3.1通过UIImageView加载GIF图"></a>1.3.1通过UIImageView加载GIF图</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> url <span class="operator">=</span> <span class="type">URL</span>(string: <span class="string">&quot;https://test/image.gif&quot;</span>)<span class="operator">!</span></span><br><span class="line">imageView.kf.setImage(with: url)</span><br></pre></td></tr></table></figure>

<h6 id="1-3-2-通过AnimatedImageView加载GIF图"><a href="#1-3-2-通过AnimatedImageView加载GIF图" class="headerlink" title="1.3.2 通过AnimatedImageView加载GIF图"></a>1.3.2 通过AnimatedImageView加载GIF图</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> url <span class="operator">=</span> <span class="type">URL</span>(string: <span class="string">&quot;https://test/image.gif&quot;</span>)<span class="operator">!</span></span><br><span class="line">animatedImageView.kf.setImage(with: url)</span><br></pre></td></tr></table></figure>

<hr>
<h5 id="1-4设置指示器：图片加载时的等待动画"><a href="#1-4设置指示器：图片加载时的等待动画" class="headerlink" title="1.4设置指示器：图片加载时的等待动画"></a>1.4设置指示器：图片加载时的等待动画</h5><h6 id="1-4-1-不使用指示器"><a href="#1-4-1-不使用指示器" class="headerlink" title="1.4.1 不使用指示器"></a>1.4.1 不使用指示器</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">imageView.kf.indicatorType <span class="operator">=</span> .none</span><br></pre></td></tr></table></figure>

<h6 id="1-4-2使用UIActivityIndicatorView作为指示器"><a href="#1-4-2使用UIActivityIndicatorView作为指示器" class="headerlink" title="1.4.2使用UIActivityIndicatorView作为指示器"></a>1.4.2使用UIActivityIndicatorView作为指示器</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">imageView.kf.indicatorType <span class="operator">=</span> .activity</span><br></pre></td></tr></table></figure>

<h6 id="1-4-3-使用图片作为指示器"><a href="#1-4-3-使用图片作为指示器" class="headerlink" title="1.4.3 使用图片作为指示器"></a>1.4.3 使用图片作为指示器</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> path <span class="operator">=</span> <span class="type">Bundle</span>.main.path(forResource: <span class="string">&quot;loader&quot;</span>, ofType: <span class="string">&quot;gif&quot;</span>)<span class="operator">!</span></span><br><span class="line"><span class="keyword">let</span> data <span class="operator">=</span> <span class="keyword">try!</span> <span class="type">Data</span>(contentsOf: <span class="type">URL</span>(fileURLWithPath: path))</span><br><span class="line">imageView.kf.indicatorType <span class="operator">=</span> .image(imageData: data)</span><br></pre></td></tr></table></figure>

<h6 id="1-4-4-使用自定义View作为指示器"><a href="#1-4-4-使用自定义View作为指示器" class="headerlink" title="1.4.4 使用自定义View作为指示器"></a>1.4.4 使用自定义View作为指示器</h6><figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 定义 实现Indeicator 协议类</span></span><br><span class="line"><span class="keyword">struct</span> <span class="title class_">CustomIndicator</span>: <span class="title class_">Indicator</span> &#123;</span><br><span class="line">    <span class="keyword">let</span> view: <span class="type">UIView</span> <span class="operator">=</span> <span class="type">UIView</span>()</span><br><span class="line">    <span class="keyword">func</span> <span class="title function_">startAnimatingView</span>() &#123; view.isHidden <span class="operator">=</span> <span class="literal">false</span> &#125;</span><br><span class="line">    <span class="keyword">func</span> <span class="title function_">stopAnimatingView</span>() &#123; view.isHidden <span class="operator">=</span> <span class="literal">true</span> &#125;</span><br><span class="line">    <span class="keyword">init</span>() &#123;</span><br><span class="line">        view.backgroundColor <span class="operator">=</span> .red</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 使用</span></span><br><span class="line"><span class="keyword">let</span> indicator <span class="operator">=</span> <span class="type">CustomIndicator</span>()</span><br><span class="line">imageView.kf.indicatorType <span class="operator">=</span> .custom(indicator: indicator)</span><br></pre></td></tr></table></figure>

<hr>
<h5 id="1-5设置transition-图片显示是转场动画效果"><a href="#1-5设置transition-图片显示是转场动画效果" class="headerlink" title="1.5设置transition 图片显示是转场动画效果"></a>1.5设置transition 图片显示是转场动画效果</h5><p>transition用于图片加载完成之后的展示动画，有以下类型</p>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> <span class="title class_">ImageTransition</span> &#123;</span><br><span class="line">    <span class="comment">// 无动画</span></span><br><span class="line">    <span class="keyword">case</span> none </span><br><span class="line">    <span class="comment">// 相当于UIView.AnimationOptions.transitionCrossDissolve</span></span><br><span class="line">    <span class="keyword">case</span> fade(<span class="type">TimeInterval</span>)</span><br><span class="line">    <span class="comment">// 相当于UIView.AnimationOptions.transitionFlipFromLeft</span></span><br><span class="line">    <span class="keyword">case</span> flipFromLeft(<span class="type">TimeInterval</span>)</span><br><span class="line">    <span class="comment">// 相当于UIView.AnimationOptions.transitionFlipFromRight</span></span><br><span class="line">    <span class="keyword">case</span> flipFromRight(<span class="type">TimeInterval</span>)</span><br><span class="line">    <span class="comment">// 相当于UIView.AnimationOptions.transitionFlipFromTop</span></span><br><span class="line">    <span class="keyword">case</span> flipFromTop(<span class="type">TimeInterval</span>)</span><br><span class="line">    <span class="comment">// 相当于UIView.AnimationOptions.transitionFlipFromBottom</span></span><br><span class="line">    <span class="keyword">case</span> flipFromBottom(<span class="type">TimeInterval</span>)</span><br><span class="line">    <span class="comment">// 自定义动画</span></span><br><span class="line">    <span class="keyword">case</span> custom(duration: <span class="type">TimeInterval</span>,</span><br><span class="line">                 options: <span class="type">UIView</span>.<span class="type">AnimationOptions</span>,</span><br><span class="line">              animations: ((<span class="type">UIImageView</span>, <span class="type">UIImage</span>) -&gt; <span class="type">Void</span>)<span class="operator">?</span>,</span><br><span class="line">              completion: ((<span class="type">Bool</span>) -&gt; <span class="type">Void</span>)<span class="operator">?</span>)</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>使用方式</p>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">imageView.kf.setImage(with: url, options: [.transition(.fade(<span class="number">0.2</span>))])</span><br></pre></td></tr></table></figure>

<hr>
<h4 id="2-Processor-图片处理器"><a href="#2-Processor-图片处理器" class="headerlink" title="2.Processor 图片处理器"></a>2.Processor 图片处理器</h4><h5 id="2-1-DefaultImageProcessor"><a href="#2-1-DefaultImageProcessor" class="headerlink" title="2.1 DefaultImageProcessor"></a>2.1 DefaultImageProcessor</h5><blockquote>
<p>将下载的数据转换为相应的UIImage。支持PNG，JPEG和GIF格式。</p>
</blockquote>
<h5 id="2-2-BlendImageProcessor-图片混合处理器"><a href="#2-2-BlendImageProcessor-图片混合处理器" class="headerlink" title="2.2 BlendImageProcessor 图片混合处理器"></a>2.2 BlendImageProcessor 图片混合处理器</h5><blockquote>
<p>修改图片的混合模式（这里不知道这么描述对不对），核心实现如下</p>
<ol>
<li>首先利用DefaultImageProcessor把Data转成image，然后去绘制</li>
<li>获取上下文</li>
<li>为上下文填充背景色</li>
<li>调用image.draw函数设置混合模式</li>
<li>从上下文中获取图片为processedImage</li>
<li>释放上下文，并返回processedImage</li>
</ol>
</blockquote>
<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> image <span class="operator">=</span> 处理之前的图片</span><br><span class="line"><span class="type">UIGraphicsBeginImageContextWithOptions</span>(size, <span class="literal">false</span>, scale)</span><br><span class="line"><span class="keyword">let</span> context <span class="operator">=</span> <span class="type">UIGraphicsGetCurrentContext</span>()</span><br><span class="line"><span class="keyword">let</span> rect <span class="operator">=</span> <span class="type">CGRect</span>(origin: .zero, size: size)</span><br><span class="line">backgroundColor.setFill()</span><br><span class="line"><span class="type">UIRectFill</span>(rect)</span><br><span class="line">image.draw(in: rect, blendMode: blendMode, alpha: alpha)</span><br><span class="line"><span class="keyword">let</span> cgImage <span class="operator">=</span> context.makeImage()</span><br><span class="line"><span class="keyword">let</span> processedImage <span class="operator">=</span> <span class="type">UIImage</span>(cgImage: cgImage, scale: scale, orientation: image.orientation)</span><br><span class="line"><span class="type">UIGraphicsEndImageContext</span>()</span><br><span class="line"><span class="keyword">return</span> processedImage</span><br></pre></td></tr></table></figure>

<h5 id="2-3OverlayImageProcessor-在image上添加一层覆盖，其本质也是混合模式，逻辑大致同上"><a href="#2-3OverlayImageProcessor-在image上添加一层覆盖，其本质也是混合模式，逻辑大致同上" class="headerlink" title="2.3OverlayImageProcessor 在image上添加一层覆盖，其本质也是混合模式，逻辑大致同上"></a>2.3OverlayImageProcessor 在image上添加一层覆盖，其本质也是混合模式，逻辑大致同上</h5><h5 id="2-4-BlurImageProcessor-给图片添加高斯模糊，用vimage实现"><a href="#2-4-BlurImageProcessor-给图片添加高斯模糊，用vimage实现" class="headerlink" title="2.4 BlurImageProcessor 给图片添加高斯模糊，用vimage实现"></a>2.4 BlurImageProcessor 给图片添加高斯模糊，用vimage实现</h5></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">Albert Yuan</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a 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data-lazy-src="/blog/img/favicon.png" onerror="this.onerror=null;this.src='/blog/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">Albert Yuan</div><div class="author-info__description">博学之,审问之,慎思之,明辨之,笃行之</div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/blog/archives/"><div class="headline">文章</div><div class="length-num">155</div></a></div><div class="card-info-data-item is-center"><a href="/blog/tags/"><div class="headline">标签</div><div class="length-num">56</div></a></div><div class="card-info-data-item is-center"><a href="/blog/categories/"><div class="headline">分类</div><div class="length-num">32</div></a></div></div><a class="button--animated" id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/yuanliangYL"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/yuanliangYL" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:yuanliangios@163.com" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="qq:1023817403" target="_blank" title="QQ"><i class="fab fa-qq"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">love cat , love life</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#Kingfisher%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90%E4%B8%80%EF%BC%9A%E5%9F%BA%E7%A1%80%E4%BD%BF%E7%94%A8"><span class="toc-text">Kingfisher源码解析一：基础使用</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8"><span class="toc-text">1.基本使用</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-1%E5%9B%BE%E7%89%87%E8%AE%BE%E7%BD%AE"><span class="toc-text">1.1图片设置</span></a><ol class="toc-child"><li class="toc-item toc-level-6"><a class="toc-link" href="#1-1-1-%E9%80%9A%E8%BF%87Resource%E8%AE%BE%E7%BD%AE%E5%9B%BE%E7%89%87%E2%80%94-%E5%9B%BE%E7%89%87URL"><span class="toc-text">1.1.1 通过Resource设置图片—-图片URL</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-1-2-%E9%80%9A%E8%BF%87ImageDataProvider%E8%AE%BE%E7%BD%AE%E5%9B%BE%E7%89%87-%E5%9B%BE%E7%89%87%E6%95%B0%E6%8D%AE%E6%8F%90%E4%BE%9B%E5%99%A8-%E2%80%94%E2%80%93Data"><span class="toc-text">1.1.2 通过ImageDataProvider设置图片(图片数据提供器)—–Data</span></a></li></ol></li><li class="toc-item toc-level-5"><a class="toc-link" href="#1-2%E5%B1%95%E7%A4%BAplaceholder"><span class="toc-text">1.2展示placeholder</span></a><ol class="toc-child"><li class="toc-item toc-level-6"><a class="toc-link" href="#1-2-1-%E9%80%9A%E8%BF%87UIImage%E8%AE%BE%E7%BD%AE"><span class="toc-text">1.2.1 通过UIImage设置</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-2-2-%E9%80%9A%E8%BF%87%E8%87%AA%E5%AE%9A%E4%B9%89View%E8%AE%BE%E7%BD%AEplaceholder"><span class="toc-text">1.2.2 通过自定义View设置placeholder</span></a></li></ol></li><li class="toc-item toc-level-5"><a class="toc-link" href="#1-3-%E5%8A%A0%E8%BD%BDGIF%E5%9B%BE-%E4%BA%8C%E8%80%85%E7%9A%84%E5%8C%BA%E5%88%AB%E8%AF%B7%E5%8F%82%E8%80%83Kingfisher%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90%E4%B9%8B%E5%8A%A0%E8%BD%BD%E5%8A%A8%E5%9B%BE"><span class="toc-text">1.3 加载GIF图 (二者的区别请参考Kingfisher源码解析之加载动图)</span></a><ol class="toc-child"><li class="toc-item toc-level-6"><a class="toc-link" href="#1-3-1%E9%80%9A%E8%BF%87UIImageView%E5%8A%A0%E8%BD%BDGIF%E5%9B%BE"><span class="toc-text">1.3.1通过UIImageView加载GIF图</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-3-2-%E9%80%9A%E8%BF%87AnimatedImageView%E5%8A%A0%E8%BD%BDGIF%E5%9B%BE"><span class="toc-text">1.3.2 通过AnimatedImageView加载GIF图</span></a></li></ol></li><li class="toc-item toc-level-5"><a class="toc-link" href="#1-4%E8%AE%BE%E7%BD%AE%E6%8C%87%E7%A4%BA%E5%99%A8%EF%BC%9A%E5%9B%BE%E7%89%87%E5%8A%A0%E8%BD%BD%E6%97%B6%E7%9A%84%E7%AD%89%E5%BE%85%E5%8A%A8%E7%94%BB"><span class="toc-text">1.4设置指示器：图片加载时的等待动画</span></a><ol class="toc-child"><li class="toc-item toc-level-6"><a class="toc-link" href="#1-4-1-%E4%B8%8D%E4%BD%BF%E7%94%A8%E6%8C%87%E7%A4%BA%E5%99%A8"><span class="toc-text">1.4.1 不使用指示器</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-4-2%E4%BD%BF%E7%94%A8UIActivityIndicatorView%E4%BD%9C%E4%B8%BA%E6%8C%87%E7%A4%BA%E5%99%A8"><span class="toc-text">1.4.2使用UIActivityIndicatorView作为指示器</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-4-3-%E4%BD%BF%E7%94%A8%E5%9B%BE%E7%89%87%E4%BD%9C%E4%B8%BA%E6%8C%87%E7%A4%BA%E5%99%A8"><span class="toc-text">1.4.3 使用图片作为指示器</span></a></li><li class="toc-item toc-level-6"><a class="toc-link" href="#1-4-4-%E4%BD%BF%E7%94%A8%E8%87%AA%E5%AE%9A%E4%B9%89View%E4%BD%9C%E4%B8%BA%E6%8C%87%E7%A4%BA%E5%99%A8"><span class="toc-text">1.4.4 使用自定义View作为指示器</span></a></li></ol></li><li class="toc-item toc-level-5"><a class="toc-link" href="#1-5%E8%AE%BE%E7%BD%AEtransition-%E5%9B%BE%E7%89%87%E6%98%BE%E7%A4%BA%E6%98%AF%E8%BD%AC%E5%9C%BA%E5%8A%A8%E7%94%BB%E6%95%88%E6%9E%9C"><span class="toc-text">1.5设置transition 图片显示是转场动画效果</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-Processor-%E5%9B%BE%E7%89%87%E5%A4%84%E7%90%86%E5%99%A8"><span class="toc-text">2.Processor 图片处理器</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#2-1-DefaultImageProcessor"><span class="toc-text">2.1 DefaultImageProcessor</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-2-BlendImageProcessor-%E5%9B%BE%E7%89%87%E6%B7%B7%E5%90%88%E5%A4%84%E7%90%86%E5%99%A8"><span class="toc-text">2.2 BlendImageProcessor 图片混合处理器</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-3OverlayImageProcessor-%E5%9C%A8image%E4%B8%8A%E6%B7%BB%E5%8A%A0%E4%B8%80%E5%B1%82%E8%A6%86%E7%9B%96%EF%BC%8C%E5%85%B6%E6%9C%AC%E8%B4%A8%E4%B9%9F%E6%98%AF%E6%B7%B7%E5%90%88%E6%A8%A1%E5%BC%8F%EF%BC%8C%E9%80%BB%E8%BE%91%E5%A4%A7%E8%87%B4%E5%90%8C%E4%B8%8A"><span class="toc-text">2.3OverlayImageProcessor 在image上添加一层覆盖，其本质也是混合模式，逻辑大致同上</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-4-BlurImageProcessor-%E7%BB%99%E5%9B%BE%E7%89%87%E6%B7%BB%E5%8A%A0%E9%AB%98%E6%96%AF%E6%A8%A1%E7%B3%8A%EF%BC%8C%E7%94%A8vimage%E5%AE%9E%E7%8E%B0"><span class="toc-text">2.4 BlurImageProcessor 给图片添加高斯模糊，用vimage实现</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas 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